i got it downgraded to 1.1.1 and jailbreaked it, but when i pop my ATT sim card in there it says no service. i used this guide. Can someone show me how to downgrade a OTB 1.1.2 to 1.1.1 and have it working with an ATT sim card?

If you are on 1.1.2 and want to downgrade, this guide will show you how. It will take your firmware and baseband back to 1.0.2,then you can upgrade back to 1.1.1 if you choose to. Start at 1.1.2 out of the box.

If you are on 1.1.2 and want to downgrade, this guide will show you how. It will take your firmware and baseband back to 1.0.2,then you can upgrade back to 1.1.1 if you choose to. Start at 1.1.2 out of the box.

I have a friend's out of the box iPhone with FW 1.1.2 and want to activate and unlock it for use with any SIM. My own iPhone (August '07) had 1.0.2 and was easy to activate and unlock.
Can I downgrade 1.1.2 to 1.0.2 and use the old method or do I have to wait for a 1.1.2 hack?